harmony 鸿蒙ImageData

2022-08-09
浏览 (2014)

ImageData

NOTE

This component is supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version.

The ImageData object is an object that stores pixel data rendered on a canvas.

Attributes

Name	Type	Description
width	number	Actual width of the rectangle on the canvas, in pixels.
height	number	Actual height of the rectangle on the canvas, in pixels.
data	<Uint8ClampedArray>	A one-dimensional array of color values. The values range from 0 to 255.

Example

<!-- xxx.hml -->
<div>
  <canvas ref="canvas" style="width: 500px; height: 500px; background-color: #ffff00;"></canvas>
</div>

// xxx.js
import promptAction from '@ohos.promptAction';
export default {
  onShow() {
    const el =this.$refs.canvas;
    const ctx = el.getContext('2d');
    ctx.fillRect(0,0,200,200)
    var imageData = ctx.createImageData(1,1)
    promptAction.showToast({
      message:imageData,
      duration:5000
    })
  }
}